Effect of weld heat input on toughness and structure of HAZ of a new super-high strength steel |
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| Authors: | Wang Juan Li Yajiang Liu Peng |
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| Affiliation: | (1) Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, 250061 Jinan, P.R. China;(2) National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, 150001 Harbin, P.R. China |
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| Abstract: | Fracture morphology and fine structure in the heat-affected zone (HAZ) of HQ130 super-high strength steel are studied by means
of SEM, TEM and electron diffraction technique. Test results indicated that the structure of HAZ of HQ130 steel was mainly
lath martensite (ML), in which there were a lot of dislocations in the sub-structure inside ML lath, the dislocation density
was about (0.3∼ 0.9) x 1012/cm2. No obvious twin was observed in the HAZ under the condition of normal weld heat input. By controlling weld heat input (E
≤20 kJ/cm), the impact toughness in the HAZ can be assured. |
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| Keywords: | Super-high strength steel heat-affected zone fracture fine structure |
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